In Parkinson's disease, Symmetrel (amantadine) is an NMDA receptor inhibitor that raises dopamine levels in the brain, which helps to relieve the symptoms of Parkinson's. For the flu, Symmetrel (amantadine) prevents the flu from making copies of itself.

Risks and Warnings for Symmetrel (amantadine)

People have died from overdosing on Symmetrel (amantadine). This has happened with relatively small doses, and is more likely if you have kidney problems. Be very careful with how you take Symmetrel (amantadine), especially the liquid version. If you notice your heartbeat change, or you have a very bad headache, talk to your doctor right away.